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Area of Science:

  • Physical Chemistry
  • Computational Chemistry
  • Analytical Chemistry

Background:

  • Electrospray ionization (ESI) coupled with mass spectrometry (MS) is a powerful technique for analyzing molecular clusters.
  • Previous research identified a highly abundant decameric uracil complex cationized with a lithium ion (U(10)Li(+)), termed a 'magic number' cluster.
  • Understanding the structural properties of such clusters is crucial for advancing molecular science and ion spectroscopy.

Purpose of the Study:

  • To investigate the fragmentation kinetics of the decameric uracil-lithium ion complex (U(10)Li(+)).
  • To elucidate the gas-phase structure of the U(10)Li(+) cluster.
  • To correlate experimental findings with theoretical structural models.

Main Methods:

  • Electrospray ionization (ESI) experiments.
  • Mass spectrometry (MS) analysis, focusing on fragmentation kinetics.
  • Ab initio and density functional theory (DFT) quantum chemistry calculations for structural optimization.

Main Results:

  • Detailed experimental data on the fragmentation pathways of the U(10)Li(+) cluster were obtained.
  • Quantum chemistry calculations provided optimized structural models for the decameric complex.
  • A stable gas-phase structure for U(10)Li(+) was proposed, consistent with all experimental observations.

Conclusions:

  • The study successfully combined experimental fragmentation kinetics with theoretical calculations.
  • A stable, experimentally supported gas-phase structure for the 'magic number' U(10)Li(+) cluster was determined.
  • This work provides significant insights into the structural characterization of ionic molecular clusters.